Hi,
I think i've resolved it.
So the APCU error you guys believed to be an separate issue in the other ticket, seems to be the root of the issue.
I resolved this by going to /etc/php.d/40.apcu.ini and uncommenting apc.enable_cli=0 and changing the 0 to a 1.
so it should show as apc.enable_cli=1
This resolved email fetch giving status as 0 and resolved the error with the cron job with the apc thing.
Hope this helps. and might be worth unlocking that other post/thread and pointing them over here to test it out.